When your car's Check Engine light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap.
If you experience any bleeding period after this 20 days, it will probably be the real period. This normally comes at about 4 to 6 weeks after the miscarriage.
So, depending on the beta-HCG levels prior to miscarriage, a menstrual period could occur as early as 4 to 6 weeks following a miscarriage. I typically counsel my patients that the body will quickly heal and again be ready for another pregnancy. I do usually recommend waiting at least until after the first menstrual period, which would indicate a return to a pre-pregnancy hormonal baseline. It does, however, take considerably longer to emotionally heal following a miscarriage.